One may still seek a relativistically correct way to determine a three dimensional charge density from form factors. Ref. [1]} makes an interesting suggestion. The goal of this note is to, after a brief review, understand the charge density definitions of [1]}, [3]} in terms of its connection to the older two dimensional relativistic densities and to do so for both unpolarized and polarized hadrons. Other recent discussions relevant to charge density expressions are in [4]}, [5]}, [6]}, [7]}.
